Re: Browser.getWindow().newXMLHttpRequest()

Thanks, this is what I was missing. 

I tried to use elemental, but could neither find formdata nor append...

I am having troubles with the event listeners:

final XMLHttpRequest xhr = Browser.getWindow().newXMLHttpRequest();
xhr.open("POST", "/upload");
xhr.setOnprogress(evt -> GWT.log("" + evt));
xhr.setOnabort(evt -> GWT.log("" + evt));
xhr.setOnerror(evt -> GWT.log("" + evt));
xhr.setOnreadystatechange(evt -> {
if (xhr.getReadyState() == XMLHttpRequest.DONE) {
try {
GWT.log("Received http response for request ");
String text = xhr.getResponseText();
if (text == null || text.isEmpty()) {
messageUi.setInnerText("no response");
} else {
messageUi.setInnerText(text);
}
} catch (Throwable e) {
GWT.log("Error", e);
}
}
});
final JsFormData formData = createFormData();
append(formData, "someFile", file);
xhr.send(formData);

I get 4 times

JsEventListener.java:42 Uncaught TypeError: this$static_0_g$.handleEvent is not a function

Any idea?

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